The correct tyre size for 17" wheels are 205/50 ZR17 (F) and 255/40 ZR17 (R).
Using the sizes you suggest will increase the overall rolling circumference and increase the radii of the wheels. That will slow your acceleration & turn in, though they will give you a softer ride.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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